Mercedes-Benz Engine

M139

The Mercedes-Benz M139 is a I4 gasoline piston engine.

Years
2019–present
Configuration
I4
Fuel
Gasoline
Top power
421 PS

AMG's hand-built 2.0-liter turbo four — the most powerful series-production four-cylinder of its era, and the heart of every 45.

Developed from the M133 but extensively reworked, the M139 keeps the 83 × 92 mm bore and stroke for 1,991 cc, adds a twin-scroll turbo, spray-guided direct injection and a closed-deck block, and is assembled one-engine-one-builder at Affalterbach. Two calibrations launched with the CLA 45: roughly 285 kW and a hotter S tune near 310 kW.

Beyond the CLA 45 it powers A 45 and GLA 45 models, and a transverse version feeds the R232 SL 43. Cylinder spacing and geometry also underpin AMG's modular 4.0-liter V8 family.

Versions.

Every factory version of the M139.

VersionDisplacementBore × StrokeCompressionPowerTorque
1391,991 cc 83 × 92 mm 9285 kW (382 hp; 387 PS) at 6,500 rpm480 N·m (354 lb·ft) at 4,750 rpm
139 S1,991 cc 83 × 92 mm 9310 kW (416 hp; 421 PS) at 6,750 rpm500 N·m (369 lb·ft) at 5,000 rpm

Applications.

Every model powered by the M139.

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